/*
 * Copyright (C) 2014 Snark
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package dominions.pkg4.mod.editor;

/**
 *
 * @author Scalie
 */
public class Functions {
    
    /**
    * Remove the file extension from a filename, that may include a path.
    * 
    * e.g. /path/to/myfile.jpg -> /path/to/myfile 
    */
   public static String removeExtension(String filename) {
       if (filename == null) {
           return null;
       }

       int index = indexOfExtension(filename);

       if (index == -1) {
           return filename;
       } else {
           return filename.substring(0, index);
       }
   }

   /**
    * Return the file extension from a filename, including the "."
    * 
    * e.g. /path/to/myfile.jpg -> .jpg
    */
   public static String getExtension(String filename) {
       if (filename == null) {
           return null;
       }

       int index = indexOfExtension(filename);

       if (index == -1) {
           return filename;
       } else {
           return filename.substring(index);
       }
   }

   private static final char EXTENSION_SEPARATOR = '.';
   private static final char DIRECTORY_SEPARATOR = '/';

   public static int indexOfExtension(String filename) {

       if (filename == null) {
           return -1;
       }

       // Check that no directory separator appears after the 
       // EXTENSION_SEPARATOR
       int extensionPos = filename.lastIndexOf(EXTENSION_SEPARATOR);

       int lastDirSeparator = filename.lastIndexOf(DIRECTORY_SEPARATOR);

       if (lastDirSeparator > extensionPos) {
  //         LogIt.w(FileSystemUtil.class, "A directory separator appears after the file extension, assuming there is no file extension");
           return -1;
       }

       return extensionPos;
   }
    
}
